CN108906042A - A kind of diesel vehicle particle supplementary set catalyst and preparation method thereof - Google Patents
A kind of diesel vehicle particle supplementary set catalyst and preparation method thereof Download PDFInfo
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- CN108906042A CN108906042A CN201810782822.8A CN201810782822A CN108906042A CN 108906042 A CN108906042 A CN 108906042A CN 201810782822 A CN201810782822 A CN 201810782822A CN 108906042 A CN108906042 A CN 108906042A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention relates to a kind of diesel vehicle particle supplementary set catalyst and preparation method thereof, belong to motor-vehicle tail-gas post-processing technology field.It rises and includes carrier, the carrier is aluminium titanates, silicon carbide or cordierite, the integral carriers with asymmetric wall-flow honeycomb structure, the coating material of catalysis oxidation carbon particle and volatile organic matter is coated on carrier, the coated weight of coating material is 1 ~ 50g/L.In coating material, load matrix using cerium oxide and aluminium oxide as precious metals pt and Pd, alkali metal（Potassium, sodium, lithium etc.）As chemistry and structural promoter.Using diesel vehicle particle supplementary set catalyst prepared by the present invention possess it is lower have carbon particle oxidation balance point temperature, because of the presence of alkali metal, increase the contact rate of carbon particle and catalyst, the enhancing of catalyst coal seed activity.To effectively reduce the discharge of particulate matter, the back pressure in C-DPF use process is reduced, while also effectively reducing the discharge of NOx.Preparation method of the present invention is simple, and step is easily operated.
Description
Technical field
The present invention relates to a kind of diesel vehicle particle supplementary set catalyst (C-DPF) and preparation method thereof, belong to motor-vehicle tail-gas
Post-processing technology field.
Background technique
With the rapid development of economy, the usage amount of automobile increases rapidly, shown according to Chinese Ministry of Environmental Protection's annual report in 2016, in recent years
China is always the first big country of motor vehicle production and marketing.2015, China's motor vehicle volume of holding reached 2.79 hundred million, and annual growth is about
14.7%.Relevant expert's prophesy, to 2020, China's motor vehicle volume of holding is up to 200,000,000.Although the use of automobile is to people
Life bring huge convenience, still, automobile usage amount increase caused by problem of environmental pollution also get worse.In recent years
Come, the atmosphere polluting problems such as haze, photochemical fog frequently occur, and the every aspect of people's clothing, food, lodging and transportion -- basic necessities of life are influenced, wherein very
Big a part of reason is come former from the discharge of motor-vehicle tail-gas.
In order to improve environment, various regions government has launched respectively the row that a series of policies and regulations carry out limiting vehicle tail gas
It puts.The exhaust emission standard carried out in the world now mainly has the three major controls such as the U.S., Europe and Japan.The U.S. is global earliest
Implement the country of automotive emission regulation.At present in three major controls discharge standard, the most widely used is European
Discharge standard, the followed by discharge standard in the U.S., Japanese emission regulation are rarely employed due to its uniqueness.Chinese motor vehicle
The emission regulation of European countries has mainly been used for reference in the formulation of the emission regulation of tail gas.
For diesel vehicle, due to using lean burn technology, fuel availability is high, good dynamic property, an oxygen in tail gas
Change carbon and hydrocarbons content is few；But since fuel oil mixes with air unevenly, lead to nitrogen oxides and granular material discharged
It is more, therefore, in order to make the discharge of exhaust gas from diesel vehicle can satisfy increasingly strict emission regulation, it would be desirable to carry out effective
The discharge of method control pollutant nitrogen oxides and particulate matter.In six stage of state, for diesel vehicle particulate matter quality (PM) and
Grain object quantity (PN) discharges easily exceeded problem, by the micro- of high performance diesel oxidation catalyst (DOC) and unsymmetric structure
Grain trap (DPF) technology combines, and realizes efficient trapping and the effective regeneration of particulate matter, makes domestic diesel vehicle PM emission control
Key technology level reaches the requirement of state's VI discharge standard.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, a kind of diesel vehicle particle supplementary set catalyst is provided
(C-DPF) and preparation method thereof, the DPF catalyst of preparation possess it is lower have carbon particle oxidation balance point temperature, because of alkali metal
Presence, increase the contact rate of carbon particle and catalyst, the enhancing of catalyst coal seed activity.To effectively reduce
The discharge of particulate matter, reduces the back pressure in C-DPF, while also effectively reducing the discharge of NOx.
According to technical solution provided by the invention, a kind of diesel vehicle particle supplementary set catalyst, including applied on carrier and carrier
The coating covered；The coating includes catalysis oxidation carbon particle and volatile organic matter, and coated weight is 1~50g/L.
The carrier is the integral carriers with asymmetric wall-flow honeycomb structure.
The carrier medium is aluminium titanates, silicon carbide or cordierite.
It include CeO in the coating2、Al2O3And alkali metal oxide.
The alkali metal oxide is the oxide of potassium, sodium or lithium.
It further include noble metal active component Pt and Pd.
The dosage of the noble metal is 0~20g/ft3, the mass ratio of Pt and Pd are 1:5~5:1.
The preparation method of the diesel vehicle particle supplementary set catalyst, step are：It will be first by the solidification of alkali-soluble salt
Object is dissolved in deionized water, is impregnated in CeO2It is roasted after upper ageing, then by Al2O3With roasting substance be added to deionization
It in water, stirs evenly, is slowly added to Pd (NO3)2Pt (NO after solution and dilution3)2In solution, it is sufficiently mixed rear ball milling, is obtained
Slurries；The slurries obtained by coating on carrier, up to diesel vehicle particle supplementary set catalyst after roasting.
Steps are as follows by weight：
(1) 0.3~0.7 part of Al is weighed2O3, 0.2~0.6 part of CeO2With 0.05~0.2 portion of alkali-soluble salt；Weigh Pt
(NO3)2With Pd (NO3)2The mass ratio of solution, Pt and Pd are 1:5~5:The dosage of 1, Pt and Pd is 0~20g/ft3；
(2) solidfied material of alkali-soluble salt is dissolved in deionized water, incipient impregnation is in CeO2On, ageing is for 24 hours；It is old
100~150 DEG C of drying 3-8h of material, 450~550 DEG C of 1~5h of roasting after change；
(3) by Al2O3It sequentially adds in 10-50 parts of deionized waters, stirs evenly with step (2) resulting materials, then slowly add
Enter Pd (NO3)2Solution stirs 1~5h, obtains slurries；
(4) by Pt (NO3)2Solution is with 1.0mol/L citric acid solution by weight 1：After 1~2 dilution, it is slowly added into step
Suddenly in the slurries that (3) obtain, stirring is uniformly mixed；
(5) slurries for obtaining step (4) pass through ball mill grinding, obtain the slurries that final granularity D90 is 1~7 μm；
(6) catalyst carrier is placed at application chamber, is applied according to the slurries that 1~50g/L of coated weight obtains step (5)
It overlays on carrier；
(7) catalyst carrier coated falls the water evaporation in coating by 100~150 DEG C of 3~8h of drying；
(8) catalyst carrier after drying is put into Muffle furnace, 450~550 DEG C of 1~5h of roasting are then cooled to room
Temperature to get arrive diesel vehicle particle supplementary set catalyst.
Beneficial effects of the present invention：Preparation method of the present invention is simple, and step is easily operated, and catalysis oxidation carbon is coated on carrier
The coating material of particle and volatile organic matter, the load matrix using cerium oxide and aluminium oxide as precious metals pt and Pd, alkali
Metal (potassium, sodium, lithium etc.) is as chemistry and structural promoter.Possessed more using diesel vehicle particle supplementary set catalyst prepared by the present invention
It is low to there is carbon particle oxidation balance point temperature to increase the contact rate of carbon particle and catalyst, catalyst because of the presence of alkali metal
It is catalyzed the enhancing of coal seed activity.To effectively reduce the discharge of particulate matter, the back pressure in C-DPF is reduced, while
Effectively reduce the discharge of NOx.
The difference is that first using alkali metals modified cerium oxide surface in the present invention, the dispersion of noble metal is effectively increased
Degree, simultaneously because Pt's and Pd is used in conjunction with, is conducive to the generation of alloy, improves the anti-caking power of catalyst, enhancing catalysis
The endurance quality of agent plays an important role to the raising of catalyst activity.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
Being all made of diameter in three examples below is 143.8mm, the asymmetric wall-flow honeycomb of cylinder of a height of 177.8mm
The integral carriers of shape structure, volume 2.888L, vehicle weight 2132-2140g.
A kind of preparation method of the diesel vehicle particle supplementary set catalyst (C-DPF) of embodiment 1, includes the following steps：
(1) 0.7 parts by weight Al is weighed2O3, 0.2 parts by weight CeO2With 0.1 part by weight of alkali metal soluble salt；Weigh Pt (NO3)2
With Pd (NO3)2The dosage of solution, Pt and Pd are 20g/ft3, the mass ratio of Pt and Pd are 5:1；
(2) solidfied material of 0.1 part by weight of alkali metal soluble salt is dissolved in 100ml deionized water, incipient impregnation is in 0.2
Parts by weight CeO2On powder, ageing is for 24 hours；By above-mentioned material drying, roasting, drying temperature is 150 DEG C, drying time 5h, roasting
Burning temperature is 550 DEG C, calcining time 2h；
(3) by 0.7 parts by weight Al2O3The material obtained with step (2) sequentially adds in 1000ml deionized water, and stirring is equal
It is even, it is slow added into Pd (NO3)2Solution stirs 2h, obtains slurries；
(4) by Pt (NO3)2With after the dilution of 80mL 1.0mol/L citric acid solution in solution, it is slowly added into step (3) and obtains
To slurries in, stirring, be uniformly mixed；
(5) slurries for obtaining step (4) pass through ball mill grinding, and the final granularity D90 of slurries is 3.0 μm；
(6) catalyst carrier is placed at application chamber, is coated according to coated weight 15g/L, step (5) is obtained
Slurries are coated on carrier；
(7) catalyst carrier coated dries 5h at 150 DEG C, and the water evaporation in coating is fallen；
(8) catalyst carrier after drying is put into Muffle furnace, 450 DEG C of roasting 2h are then cooled to room temperature.
A kind of preparation method of the diesel vehicle particle supplementary set catalyst (C-DPF) of embodiment 2, includes the following steps：
(1) 0.5 parts by weight Al is weighed2O3, 0.45 parts by weight CeO2With 0.05 part by weight of alkali metal soluble salt；Weigh Pt
(NO3)2With Pd (NO3)2The dosage of solution, Pt and Pd are 5g/ft3, the mass ratio of Pt and Pd are 4:1；
(2) solidfied material of 0.05 part by weight of alkali metal soluble salt is dissolved in 225ml deionized water, incipient impregnation in
0.45 parts by weight CeO2On powder, ageing is for 24 hours；By above-mentioned material drying, roasting, drying temperature is 150 DEG C, and drying time is
5h, maturing temperature are 550 DEG C, calcining time 2h；
(3) by 0.5 parts by weight Al2O3The material obtained with step (2) sequentially adds in 1000ml deionized water, and stirring is equal
It is even, it is slow added into Pd (NO3)2Solution stirs 2h, obtains slurries；
(4) by Pt (NO3)2With after the dilution of 80ml citric acid solution in solution, it is slowly added into the slurries that step (3) obtains
In, stirring is uniformly mixed；
(5) slurries for obtaining step (4) pass through ball mill grinding, and the final granularity D90 of slurries is 6.6 μm；
(6) catalyst carrier is placed at application chamber, is coated according to coated weight 15g/L, step (5) is obtained
Slurries are coated on carrier；
(7) catalyst carrier coated dries 5h at 150 DEG C, and the water evaporation in coating is fallen；
(8) catalyst carrier after drying is put into Muffle furnace, 450 DEG C of roasting 2h are then cooled to room temperature.
A kind of preparation method of the diesel vehicle particle supplementary set catalyst (C-DPF) of embodiment 3, includes the following steps：
(1) 0.3 parts by weight Al is weighed2O3, 0.5 parts by weight CeO2With 0.2 part by weight of alkali metal soluble salt；Weigh Pt (NO3)2
With Pd (NO3)2The dosage of solution, Pt and Pd are 10g/ft3, the mass ratio of Pt and Pd are 1:5；
(2) solidfied material of 0.2 part by weight of alkali metal soluble salt is dissolved in 250ml deionized water, incipient impregnation is in 0.5
Parts by weight CeO2On powder, ageing is for 24 hours；By above-mentioned material drying, roasting, drying temperature is 150 DEG C, drying time 5h, roasting
Burning temperature is 550 DEG C, calcining time 2h；
(3) by 0.3 parts by weight Al2O3The material obtained with step (2) sequentially adds in 1000ml deionized water, and stirring is equal
It is even, it is slow added into Pd (NO3)2Solution stirs 2h, obtains slurries；
(4) by Pt (NO3)2With after the dilution of 80ml citric acid solution in solution, it is slowly added into the slurries that step (3) obtains
In, stirring is uniformly mixed；
(5) slurries for obtaining step (4) pass through ball mill grinding, and the final granularity D90 of slurries is 5.1 μm；
(6) catalyst carrier is placed at application chamber, is coated according to coated weight 20g/L, step (5) is obtained
Slurries are coated on carrier；
(7) catalyst carrier coated dries 5h at 150 DEG C and falls the water evaporation in coating；
(8) catalyst carrier after drying is put into Muffle furnace, 450 DEG C of roasting 2h are then cooled to room temperature.
Regeneration balance point temperature measurement is carried out to the DPF catalyst that embodiment 1-3 is obtained, test result is as shown in table 1.
1 DPF catalyst regeneration balance point temperature of table and backpressure results
Claims (9)
1. a kind of diesel vehicle particle supplementary set catalyst, it is characterized in that：Including the coating coated on carrier and carrier；The coating packet
Catalysis oxidation carbon particle and volatile organic matter are included, coated weight is 1 ~ 50g/L.
2. diesel vehicle particle supplementary set catalyst as described in claim 1, it is characterized in that：The carrier is with asymmetric wall-flow type
The integral carriers of honeycomb structure.
3. diesel vehicle particle supplementary set catalyst as described in claim 1, it is characterized in that：The carrier medium is aluminium titanates, carbonization
Silicon or cordierite.
4. diesel vehicle particle supplementary set catalyst as described in claim 1, it is characterized in that：It include CeO in the coating2、Al2O3With
Alkali metal oxide.
5. diesel vehicle particle supplementary set catalyst as claimed in claim 4, it is characterized in that：The alkali metal oxide be potassium, sodium or
The oxide of lithium.
6. diesel vehicle particle supplementary set catalyst as claimed in claim 4, it is characterized in that：Further include noble metal active component Pt and
Pd。
7. diesel vehicle particle supplementary set catalyst as claimed in claim 6, it is characterized in that：The dosage of the noble metal is 0 ~ 20g/
ft3, the mass ratio of Pt and Pd are 1:5~5:1.
8. the preparation method of diesel vehicle particle supplementary set catalyst described in one of claim 1-7, it is characterized in that：It will be first by alkali gold
The solidfied material for belonging to soluble salt is dissolved in deionized water, is impregnated in CeO2It is roasted after upper ageing, then by Al2O3With roasting object
Matter is add to deionized water, and is stirred evenly, and Pd is slowly added to（NO3）2Pt after solution and dilution（NO3）2In solution, sufficiently
Ball milling after mixing, obtains slurries；The slurries obtained by coating on carrier, up to diesel vehicle particle supplementary set catalyst after roasting.
9. the preparation method of diesel vehicle particle supplementary set catalyst as claimed in claim 8, it is characterized in that step is such as by weight
Under：
（1）Weigh 0.3 ~ 0.7 part of Al2O3, 0.2 ~ 0.6 part of CeO2With 0.05 ~ 0.2 portion of alkali-soluble salt；Weigh Pt（NO3）2With
Pd（NO3）2The mass ratio of solution, Pt and Pd are 1:5~5:The dosage of 1, Pt and Pd is 0 ~ 20g/ft3；
（2）The solidfied material of alkali-soluble salt is dissolved in deionized water, incipient impregnation is in CeO2On, ageing is for 24 hours；After ageing
100 ~ 150 DEG C of drying 3-8h of material, 450 ~ 550 DEG C of 1 ~ 5h of roasting；
（3）By Al2O3And step（2）Resulting materials sequentially add in 10-50 parts of deionized waters, stir evenly, are slow added into Pd
（NO3）2Solution stirs 1 ~ 5h, obtains slurries；
（4）By Pt（NO3）2Solution is with 1.0 mol/L citric acid solutions by weight 1：After 1 ~ 2 dilution, it is slowly added into step
（3）In obtained slurries, stirring is uniformly mixed；
（5）By step（4）Obtained slurries pass through ball mill grinding, obtain the slurries that final granularity D90 is 1 ~ 7 μm；
（6）Catalyst carrier is placed at application chamber, according to 1 ~ 50g/L of coated weight by step（5）Obtained slurries are coated in
On carrier；
（7）The catalyst carrier coated falls the water evaporation in coating by 100 ~ 150 DEG C of 3 ~ 8h of drying；
（8）Catalyst carrier after drying is put into Muffle furnace, 450 ~ 550 DEG C of 1 ~ 5h of roasting, be then cooled to room temperature to get
To diesel vehicle particle supplementary set catalyst.
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Cited By (4)
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| CN110124667A (en) * | 2019-04-30 | 2019-08-16 | 昆明贵研催化剂有限责任公司 | A kind of Novel diesel engine catalyst of alternative DOC+CDPF system |
| CN110193366A (en) * | 2019-06-06 | 2019-09-03 | 无锡威孚环保催化剂有限公司 | Catalyst and preparation method thereof with good soot ignition performance |
| CN111514922A (en) * | 2020-05-09 | 2020-08-11 | 无锡威孚环保催化剂有限公司 | DPF catalyst with better dispersity and preparation method thereof |
| CN113019434A (en) * | 2021-03-17 | 2021-06-25 | 成都科特瑞兴科技有限公司 | Coated catalyst for low-temperature hydrogen deoxidation and preparation method and application thereof |
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| CN110124667A (en) * | 2019-04-30 | 2019-08-16 | 昆明贵研催化剂有限责任公司 | A kind of Novel diesel engine catalyst of alternative DOC+CDPF system |
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| CN111514922A (en) * | 2020-05-09 | 2020-08-11 | 无锡威孚环保催化剂有限公司 | DPF catalyst with better dispersity and preparation method thereof |
| CN111514922B (en) * | 2020-05-09 | 2022-12-13 | 无锡威孚环保催化剂有限公司 | DPF catalyst with better dispersity and preparation method thereof |
| CN113019434A (en) * | 2021-03-17 | 2021-06-25 | 成都科特瑞兴科技有限公司 | Coated catalyst for low-temperature hydrogen deoxidation and preparation method and application thereof |
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